Update of bug #20360 (project wesnoth):
Status: None => Fixed
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Follow-up Comment #5:
For future reference, here is what seems to be happening. The crash occurs in
escaped_string() when it is called from
write_key_val_visitor::operator()(t_string const&). That calling function
consists of a loop whose loop control variable is a t_string::walker, and that
walker is constructed from a t_string. All looks fine so far.
The first wrinkle is that a walker does not have a constructor from a
t_string. The code compiles though, since it does have a constructor from a
t_string_base, and t_string is implicitly convertible to t_string_base. The
root of the problem is here: t_string is implicitly convertible to a
t_string_base object, not to a const reference to a t_string_base. That means
that the constructor is actually called with a temporary t_string_base object
(which is not guaranteed to exist after the construction is complete).
Things can blow up later because a walker retains a reference to one of the
data fields in the object it is initialized from (and that object might no
longer exist when the reference is used).
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